The 411: More than 300 patrons were feeling festive as they cruised the arboretum grounds to see the $2 million 12 Days of Christmas exhibit featuring gazebos with life-size Victorian-costumed mannequins or whimsical animals accompanied by music. The idea for this holiday extravaganza came from donors Phyllis and Tom McCasland. Back at the DeGolyer House, guests perused the assortment of Byers’ Choice Ltd. Christmas carolers on display, donated by Kim and John Semyan, who collected the figurines throughout the world. The 12 Days of Christmas exhibit runs through January 4.